9.2.1.2
User-programmable inverse-time characteristics
The user can define curves by entering parameters into the following standard
formula.
GUID-775FD6DE-7F45-4112-A154-79F599BBA74F V1 EN
(Equation 22)
t[s] Operate time (in seconds)
A
set
Curve parameter A
B
set
Curve parameter B
C
set
Curve parameter C
E
set
Curve parameter E
I
Measured current
I>
set
Start value
k
set
Time multiplier
9.2.1.3
RI and RD-type inverse-time characteristics
The RI-type simulates the behavior of electromechanical relays. The RD-type is an
earth-fault specific characteristic.
The RI-type is calculated using the formula
t s
k
I
I
[ ]
.
.
=
−
× >
0 339
0 236
GUID-93D85F4E-FBFC-4B6D-BEF8-CBB1E8DCDB0D V1 EN
(Equation 23)
The RD-type is calculated using the formula
t s
I
k
I
[ ]
.
.
=
−
×
× >
5 8 1 35 In
GUID-0624AC12-4B2A-43E7-8357-9D8EA9B38689 V1 EN
(Equation 24)
t[s]
Operate time (in seconds)
k
set
Time multiplier
I
Measured current
I>
set
Start value
1MRS757256 F
Section 9
General function block features
PML630/Compact Load-Shedding Solution
341
Technical Manual
Содержание Relion 630 Series
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